Valve.



G. B. KENNINGTON.

VALVE.

APPLICATION FILED SEPT. 7, 1909.

Petented Feb.8,1910.

2 SHEETS-SHEET 1,

F I E l A INVENTon G. B. KENNINGTON.

VALVE. l APPLICATION FILED SEPT. 7, 1909.

Patented Feb. 8, 1910.

2 SHEETS-SHEET 2.

VIELE Efo 141 l UNITED STATES PATENT OFFICE.,

GEORGE B. KENNINGTON, OF PITTSBURG, PENNSYLVANIA, SSIGNOR TO GOLDEN- ANDERSON VALVE SPECIALTY;(lfPANY,A OF PITTSBURG, PENNSYLVANIA, A COR- PORATION 0F .PENNSYLVANIA f vnnvii.

Patented. Feb. s, 191e Application led September 7, 1909. Serial No. 516,482.`

492,051, filed April 24, 1909, by Charles E.v

Golden.

' The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification Eigure 1 1s a sectional 'elevation showing my improved pilot valve and its connection with the nonvreturn valve and the steam supply pipe, Fig.

2 vis a sectional elevation onenlarged scale of the pilot valve'.

In the practice of m invention the pilot valve consists of ashel or casing 1, closed at its lower end by a hollow threaded plug 2 screwing into the shell and lhaving a plunger 3 also preferably hollow, movably mounted in its upper end. -Between the plug and plunger 1s arranged ,a spring 4 whose tenslon can be adjusted by the plug 2. The plunger is provided with'a iiange- 5 normally resting on the upper plate of the casing 1, which is constructed so as to form in connection with the cap 6 a chamber at the upper end 0f the casing. This chamber is divided into two compartments b a diaphragm 7 having its edges-secured tween the cap and upperend of the casing. This diaphragm rests upon the upper end ofthe plunger 3. A stem 8 is connected to the plunger and extends down through the plug 2 bearing at its lower end on a lever 9 vpivs otally mounted in the yoke 10 preferably carried by the casing. This lever is also connected at its free end with a valve 11 arranged in the shell 12 in such manner as to seat against the flow of iiuidthrough the valve. Any suitable construction may .be employed for holding the valve in open posit-ion and against movement b the spring 4. A suitab e construction to t Aat end consists of the swinging arm 13 so lpivot-ally mounted in the yoke that the lower end i have invented which is provided with a hoop 14 will have a bias to swing into engagement with a shoulder 15 on the valve stem or lever, when the latter is raised, thereby holding the valve 11 in open position. In arranging this pilot valve to control the operation of the non-return valve, the upper compartment of the chamber in the casing 1 is connected by a pipe 16 to the steam line 17 extending from the boiler at a point outside of the location of the non-return valve which is also located in the steam line. inlet port of the valve casing 12 is connected by a pipe 1S -to a port 19 in the lower 4end of the cylinder 20 on the non-return valve. The upper end of this cylinder is connected by a pipe 21 with the inlet port of t-he non-return valve or to the steam supply pipe at a point inside of the non-return valve, or between it and the boiler. When the parts are thus connected boiler pressure will be exerted on the upper side of the.

piston 22 to close the non-return valve and toa port through or around said piston so that the same pressure will be normally maintained on both sides of the piston and in theconnecting pipe18. Boiler pressure vor the norma-l pressure in the steam line will be maintained on the top of the diaphragm 7 thus forcing down the plunger 3 and with it the stem 8 against the tension of the spring 4. When thus forced down by steam pressure in the upper compartment of the pilot valve, the stem acting through the lever 9 will hold the valve 11 .in closed position. In case of a break in the steam line, the pressure on the diaphragm 7 will be relieved permitting the spring 4 to expand thereby lifting the stem 8. As soon as relieved of the pressure of the stem 8, the

is reducedonA the underside of the piston the pressure on the upper side of the piston which is of greater areathan the valve,

will vforce the latter to closed position, thereby stopping the i'low of steam into the supply line.

The tension of the spring 4 is adjusted The -valve 11 will be shifted to open position by so as to permit a variation in the steam supply line due to the normal use of steam in the plant Without permitting of the opening of valve l1. By the employment of a lever it is possible to adjust .the leverage so that boiler pressure Which is constantly exerted on the under side of the valve 11 Will shift the valve for a slight reduction of pressure on the diaphragm 7. lIt will be observed that the catch or hook 13 will automatically engage the lever or the stem of valve 1l, and hold the same in open position. While this valve is open sufficient pressure cannot accumulate under the piston of the non-re turn valve to permit of the opening of said valve by the pressure on the under side thereof.

I claim herein as my invention:

y l. In a valve mechanism, the combination of a casing having a passage therethrough, a valve controlling said passage, a cylinder, a piston arranged in said cylinder, a port or passage for conducting fluid under pressure to that side or' the piston Where it Will operate to close the valve, means for permitting the flow of fluid to the opposite side of the piston, a valve mechanism controlling the escape of fluid pressure from the cylinder on the side of the piston opposite that on Which fluid pressure is introduced into the cylinder, and a lock for holding such valve mechanism in open position.

2. In a valve mechanism the combination of a valve adapted to be opened by Huid 3. In a valve mechanism the combination .of a valve adapted to be opened by fluid pressure, a shell or casing, a plunger arranged in said shell and operative by Huid pressure to close said valve and hold it normally in closed position and a lock for holding the valve in open position.

4. In a valve mechanism, the combination of a valve, a lever connected to the stem of the valve, a shell or casing, a plunger arranged in said casing and operative in one direction by fluid pressure, a spring for shifting the plunger in the opposite direction and a stem connected'to the plunger and engaging the lever.

5. In a valve mechanism, the combination of a valve, a lever connected to the stem of the valve, a'shell or casing, a plunger arf ranged in said casing and operativein one direction by fluid pressure, a spring for shifting the plunger in the opposite direction and a stem connected to the plunger and engaging the lever, and a lock for holding the valve in open position.

In testimony whereof, I have hereunto set my hand.

GEORGE B. KEN NINGTON.

Witnesses:

CHARLES BARNETT, FRANCIS J ToMAssoN. 

